Water temperature increase impact on the thermal efficiency of the boiler? A: The water temperature to improve thermal efficiency of the boiler can be divided into two cases to discuss. The first case, assuming constant evaporation boiler. When the water temperature increase, due to the economizer heat transfer temperature difference is reduced, reducing heat absorption, enhance the tobacco temperature economizer, air preheater temperature and pressure increase, increase heat transfer, the hot air temperature increased slightly, smoke the temperature rises, so that boiler efficiency is lowered. However, after the water temperature increase, increase in the heat for evaporating the evaporation increases. In order to maintain unchanged the amount of evaporation, it is necessary to reduce the amount of fuel, which makes the exhaust gas temperature is lowered to improve the thermal efficiency of the boiler. Because of these two factors on the thermal efficiency of the boiler roughly, therefore, when the constant holding evaporation boiler, the thermal efficiency of the boiler feed water temperature increase substantially unchanged. The second case, assuming that the same amount of fuel. After the water temperature increase, decrease temperature and pressure economizer, economizer flue gas temperature, increasing the air preheater heat absorption, the exhaust gas temperature rises, reduce the heat efficiency of the boiler. Since the hot air temperature is increased, the furnace temperature increases, water wall heat absorption increases. After the water temperature increase, the heat for increasing the temperature is reduced, while increasing the amount of heat for evaporation. Therefore, the water temperature increase, if the fuel quantity constant, the increased evaporation, but the thermal efficiency is lowered. To sum up, raise water temperature, evaporation is kept constant regardless of the amount of fuel still remains the same, we can not improve boiler efficiency. However, to improve the water temperature, it does improve the thermal efficiency of the plant cycle, thereby reducing the coal consumption.
Buy domestic boilers domestic boilers method is mainly used for heating or hot water when used in life, the use of safe and efficient equipment, widely used, then the purchase should pay attention to those problems? Many people may not know much about this small series for everyone to explain the specific purchase method. First, the good general boiler water temperature constant, constant water flow, the use of secondary heat exchanger, gas and water with ease conflicts, the water temperature constant. Second, energy-efficient and comfortable. Whatever your choice of products, energy efficiency and comfort is to improve the basic quality of life standards. Electric heating is a few years ago once popular heating methods, but because power consumption is too large, may also increase security risks, therefore, energy-saving and comfortable heating equipment has become a consumer demand. Plumbing boiler mostly used wall-mounted gas boiler, external to the indoor thermostat, in order to personalize the temperature regulation and energy saving purposes. Indoor temperature controller efficiency of 20 to 28% of the gas cost. Third, easy to control. A good control system is normal household boilers, combustion operation to ensure the safety of inspection, maintenance, daily operation and fault analysis has important significance. It is essential to choose a high-performance boilers, especially at home with the elderly and children, not only to control the temperature of rooms according to their needs free to set the heating temperature, but also be able to set the temperature ahead of time before going home, a home to enjoy the warmth. Fourth, after-sales service continuity. For consumers in the purchase of products, especially bulky products, after-sales service is perfect and is an important factor. Professional companies generally have a complete service network and service system, not only to see the performance of enterprises and planning, but also is to look at business and professional qualifications, each link must be professional in order to ensure that the entire process of convergence of efficient, smooth. These are the purchase method of domestic boilers, at the time of purchase, not only to understand their true needs, but also according to different purchase models appropriate requirements of the boiler, the boiler using this feature was more in line with application requirements.
Chongyang County, Hubei Province since the second half of 2015 to carry out the work out of small coal-fired boilers, non-New 20 tons of steam / hour and below the coal-fired boilers, the full implementation of small coal-fired boilers out of work, with environmental protection, Development and Reform Commission, by letter and other related sector wages, work to strengthen the efforts to promote thorough investigation of strict control to ensure that the county's non-compliance of small coal-fired boilers have all been eliminated remediation. In the specified date (June 30, 2017) completed the small coal-fired boilers out of the task before. Up to now, Chongyang County is not a new coal-fired boilers.
It is understood that, recently, joint quality supervision department of Chongyang County People's Government of Hubei Province, a special selection of personnel to carry out "looking back" activities for the phasing out small coal-fired boilers, special personnel division of responsibilities is based on special teams, focus on examination paper, under chemicals, wine, agriculture, and several other sectors and enterprises of boiler equipment, non-small coal-fired boilers happen "resurgence" phenomenon.
First, the economic advantages and a gas boiler, because gas in the ash, low sulfur and nitrogen than coal combustion, very small amount of dust in the flue gas, the gas discharge apparatus is easy to meet the state required standard, can greatly reduce the pollution of the environment, good environmental performance. 2, the absence of gas boiler heating surface contamination, slagging, wear problems, so you can use a high-speed cigarette, to reduce the size of the convection heating surface. Such fumes away less heat energy, thermal efficiency of the boiler is also higher. 3, the attachment device does not require gas boiler gas, slag, dust removal machine, grate like, saving the boiler equipment investment. 4, due to the use of natural gas piped gas boilers for fuel, gas boilers do not need fuel storage, saving transportation costs, storage space and labor management, and many other costs, so the cost of this off than coal-fired boiler more affordable. 5, the boiler operation, regulation and reduce heating costs. 5.1 gas heating boiler load adaptability, in accordance with the load (water temperature) flexibility to adjust the size of the fire. 5.2 System start fast, reduce the consumption of all kinds of preparatory work brings. 5.3 Due to the small less ancillary equipment, power consumption is lower than coal-fired boilers. 5.4 less gas inside the magazine, high and low temperature boiler heating surface corrosion does not occur, boiler continuous long run, less failure. 5.5 accurate gas metering simple, easy to adjust the amount of gas supply. 6, in reducing equipment maintenance, gas burning boilers coefficient simple equipment, thus requiring less maintenance equipment maintenance, long life heated tube. 7, gas-fired boiler simple to operate, easy to achieve automatic control. Second, the environmental benefits of gas boilers: gas boilers due to the combustion of fuel in the combustion process, and clean burning, non-polluting emissions, is by far the most environmentally friendly energy sources. Coal combustion emissions containing sulfur and ash content are more environmental pollution more serious, which is incomparable with gas boiler. Gas boiler can bring greater environmental benefits to the enterprise. Third, differences in coal-fired boilers and gas boilers: because of different physical and chemical properties of coal and natural gas, and therefore, there is a big difference in characteristics of coal-fired boilers and gas boilers. 1, combustion: fuel fired boiler combustion layer, fired by coal chain grate conveyor plane, the complete combustion process in the furnace. While the combustion gas boiler combustion chamber, the gas is mixed with air in advance is set in proportion to the burner, injected into the furnace through a nozzle, the torch was installed in the furnace to complete combustion. 2, combustion products: coal is mainly composed of C, H, S, O, N, and other elements composed of ash and water, but not the mechanical mixing of these components, but a very complex compound. After the coal combustion heat release and smoke into the hot air generated by the SO²SO³NOx, pollution of the environment and the human body can cause damage. And the main component of natural gas is methane (CH4) gas, and a small amount of non-hydrocarbon gas, generally free of moisture and ash after the combustion of natural gas, mainly CO2 and water to generate and emit a lot of heat, deleterious SO2, SO3, NOX coal and other emissions is relatively much less. 3, automatic control of the boiler: coal-fired boiler due to factors coal, coal seam thickness, the amount of blowing, the wind amount, and the air volume distribution grate speed limit, to be difficult to automatically adjust the operating parameters of the boiler according to the load. Less impact on the factors of the gas boiler, the burner can be adjusted only according to the size of the fire load, easy to achieve automatic control.
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